The tower was likely built by the Galway family shortly before 1564, based on a patent roll from that date, and may have remained inhabited until 1832 when Dundanion House was constructed on the grounds. The ground floor entrance, located near the eastern end of the north wall, opens into a lobby with both outer and inner lintelled doors. From here, straight mural stairs rise along the western side to the northwest corner, where they transform into spiral stairs providing access to the first and second floors, before ending in a short mural stair within the west wall that leads to the wall walk.

The tower’s interior retains several original features, including stone corbels at all levels that once supported wooden floors, and fireplaces on both the first and second floors. The first floor fireplace sits in the east wall with a large limestone lintel, whilst the second floor has a fireplace in the southeast corner, though its lintel and breast are missing and a brick stack now rises from the corner above. Most window openings have been broken and modified over time, except those in the west wall, which preserve their original character; the first floor features a wide, tall square-set embrasure with a segmental arch to the rear and a flat-headed light in a smaller central lintelled embrasure, whilst the second floor has a similar arrangement but with twin lights that were once divided by a mullion, now missing.

The annexe, accessed through a doorway broken through the tower’s east wall at ground level, was built against the northern end of the tower’s eastern wall, though only its north wall survives today, stretching five metres with short returns to the south. This remaining wall is a gabled, two-storey end wall featuring a large ground-level fireplace with a brick-lined bread oven on its eastern side. Dundanion House itself, now serving as the well-maintained offices of Telecom Éireann, presents a south-facing front of five bays over two storeys above a basement, with a porch supported by four slender columns. The building extends five bays deep with a three-bay bow projection to the rear and a hipped roof with valley, whilst an inscription reading “1860 DK” is moulded in plaster on the barrel vault in the basement.